Renames example_wm to mash_wm

mash/wm/window_manager_apptest.cc

Index: mash/wm/window_manager_apptest.cc
diff --git a/mash/wm/window_manager_apptest.cc b/mash/wm/window_manager_apptest.cc
index 515b478b95a00b02ec98517bbde5a1d5cc59c8c9..15584afe5aa69c1e7f2e8901793bc1ae3b53dce6 100644
--- a/mash/wm/window_manager_apptest.cc
+++ b/mash/wm/window_manager_apptest.cc
@@ -22,7 +22,7 @@ class WindowManagerAppTest : public mojo::test::ApplicationTestBase,
 
  protected:
   void ConnectToWindowManager(mus::mojom::WindowManagerPtr* window_manager) {
-    application_impl()->ConnectToService("mojo:example_wm", window_manager);
+    application_impl()->ConnectToService("mojo:mash_wm", window_manager);
   }
 
   mus::Window* OpenWindow(mus::mojom::WindowManager* window_manager) {
@@ -30,6 +30,7 @@ class WindowManagerAppTest : public mojo::test::ApplicationTestBase,
     mojo::InterfaceRequest<mus::mojom::WindowTreeClient>
         window_tree_client_request = GetProxy(&window_tree_client);
     mojo::Map<mojo::String, mojo::Array<uint8_t>> properties;
+    properties.mark_non_null();
     window_manager->OpenWindow(window_tree_client.Pass(), properties.Pass());
     mus::WindowTreeConnection* connection = mus::WindowTreeConnection::Create(
         this, window_tree_client_request.Pass(),